diff -urN libdvdnav-4.1.3/configure.ac libdvdnav-4.1.3-haiku/configure.ac
--- libdvdnav-4.1.3/configure.ac	2009-02-19 07:41:01.000000000 +0000
+++ libdvdnav-4.1.3-haiku/configure.ac	2009-02-19 07:33:27.000000000 +0000
@@ -145,6 +145,8 @@
     ;;
   *mingw32* | *cygwin*)
     ;;
+  *haiku*)
+    ;; 
   *)
     AC_CHECK_LIB(pthread, pthread_create,
 	[THREAD_LIBS="-lpthread"],
@@ -165,6 +167,8 @@
   *cygwin*)
     LDFLAGS="-no-undefined $LDFLAGS"
     ;;
+  *haiku*)
+    ;;
   *)
     AC_CHECK_LIB(c, dlopen,
 	         DYNAMIC_LD_LIBS="",